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以从美国引进的转 Bt基因棉“保铃棉 32 B”为参考 ,比较鉴定我国自行研制的第一个转 Bt基因棉品种“国抗棉 1号”对棉铃虫的抗性 ,研究温度和肥料等因素对抗虫性的影响。结果表明 :“国抗棉 1号”抗虫性低于“保铃棉 32 B”,抗性等级分别评价为“抗”和“高抗”;随着施肥量的增加 ,转 Bt基因棉对低龄棉铃虫幼虫的抗虫活性和抑制生长作用增强 ,低肥时抗虫性降低严重 ;随温度升高 ,转 Bt基因棉对低龄棉铃虫幼虫的抗虫活性增强 ,低温 ( 1 6℃ )下抗虫活性明显降低 ,但随处理时间的推进 ,高温 ( 36℃ )下迅速生长至高龄的棉铃虫幼虫 ,强迫取食转 B t基因棉 ,仍表现出较好的适应性
Taking the transgenic Bt cotton “B32B” introduced from the United States as a reference, the resistance to cotton bollworm (Helicoverpa armigera), the first Bt transgenic cotton variety developed in China, was compared and identified. The effects of temperature and Fertilizer and other factors on insect resistance. The results showed that the resistance of “Guo-resistant cotton 1” was lower than that of “Boll-resistant cotton 32 B” and the resistance levels were evaluated as “anti-resistance” and “high resistance” The resistance to insecticidal activity and growth inhibition of young cotton bollworm larvae were enhanced, and the resistance to insecticide was decreased seriously under low fat. With the increase of temperature, the resistance of transgenic Bt cotton to the larvae of the lower age bollworm was enhanced. Under low temperature (16 ℃) However, with the advance of treatment time, the cotton bollworm larvae that grew rapidly at high temperature (36 ℃) and forced to feed transgenic Bt cotton still showed good adaptability